/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
* the License for the specific language governing permissions and limitations under the License.
*/
package io.reactivex.internal.operators.observable;
import static org.junit.Assert.*;
import static org.mockito.ArgumentMatchers.*;
import static org.mockito.Mockito.*;
import java.util.*;
import java.util.concurrent.Callable;
import org.junit.*;
import org.mockito.InOrder;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.TestHelper;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.Function;
import io.reactivex.internal.functions.Functions;
import io.reactivex.internal.fuseable.QueueDisposable;
import io.reactivex.observers.*;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.subjects.UnicastSubject;
public class ObservableDistinctTest {
Observer<String> w;
// nulls lead to exceptions
final Function<String, String> TO_UPPER_WITH_EXCEPTION = new Function<String, String>() {
@Override
public String apply(String s) {
if (s.equals("x")) {
return "XX";
}
return s.toUpperCase();
}
};
@Before
public void before() {
w = TestHelper.mockObserver();
}
@Test
public void testDistinctOfNone() {
Observable<String> src = Observable.empty();
src.distinct().subscribe(w);
verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
verify(w, times(1)).onComplete();
}
@Test
public void testDistinctOfNoneWithKeySelector() {
Observable<String> src = Observable.empty();
src.distinct(TO_UPPER_WITH_EXCEPTION).subscribe(w);
verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
verify(w, times(1)).onComplete();
}
@Test
public void testDistinctOfNormalSource() {
Observable<String> src = Observable.just("a", "b", "c", "c", "c", "b", "b", "a", "e");
src.distinct().subscribe(w);
InOrder inOrder = inOrder(w);
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext("b");
inOrder.verify(w, times(1)).onNext("c");
inOrder.verify(w, times(1)).onNext("e");
inOrder.verify(w, times(1)).onComplete();
inOrder.verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
}
@Test
public void testDistinctOfNormalSourceWithKeySelector() {
Observable<String> src = Observable.just("a", "B", "c", "C", "c", "B", "b", "a", "E");
src.distinct(TO_UPPER_WITH_EXCEPTION).subscribe(w);
InOrder inOrder = inOrder(w);
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext("B");
inOrder.verify(w, times(1)).onNext("c");
inOrder.verify(w, times(1)).onNext("E");
inOrder.verify(w, times(1)).onComplete();
inOrder.verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
}
@Test
@Ignore("Null values no longer allowed")
public void testDistinctOfSourceWithNulls() {
Observable<String> src = Observable.just(null, "a", "a", null, null, "b", null);
src.distinct().subscribe(w);
InOrder inOrder = inOrder(w);
inOrder.verify(w, times(1)).onNext(null);
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext("b");
inOrder.verify(w, times(1)).onComplete();
inOrder.verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
}
@Test
@Ignore("Null values no longer allowed")
public void testDistinctOfSourceWithExceptionsFromKeySelector() {
Observable<String> src = Observable.just("a", "b", null, "c");
src.distinct(TO_UPPER_WITH_EXCEPTION).subscribe(w);
InOrder inOrder = inOrder(w);
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext("b");
inOrder.verify(w, times(1)).onError(any(NullPointerException.class));
inOrder.verify(w, never()).onNext(anyString());
inOrder.verify(w, never()).onComplete();
}
@Test
public void error() {
Observable.error(new TestException())
.distinct()
.test()
.assertFailure(TestException.class);
}
@Test
public void fusedSync() {
TestObserver<Integer> to = ObserverFusion.newTest(QueueDisposable.ANY);
Observable.just(1, 1, 2, 1, 3, 2, 4, 5, 4)
.distinct()
.subscribe(to);
ObserverFusion.assertFusion(to, QueueDisposable.SYNC)
.assertResult(1, 2, 3, 4, 5);
}
@Test
public void fusedAsync() {
TestObserver<Integer> to = ObserverFusion.newTest(QueueDisposable.ANY);
UnicastSubject<Integer> us = UnicastSubject.create();
us
.distinct()
.subscribe(to);
TestHelper.emit(us, 1, 1, 2, 1, 3, 2, 4, 5, 4);
ObserverFusion.assertFusion(to, QueueDisposable.ASYNC)
.assertResult(1, 2, 3, 4, 5);
}
@Test
public void fusedClear() {
Observable.just(1, 1, 2, 1, 3, 2, 4, 5, 4)
.distinct()
.subscribe(new Observer<Integer>() {
@Override
public void onSubscribe(Disposable d) {
QueueDisposable<?> qd = (QueueDisposable<?>)d;
assertFalse(qd.isEmpty());
qd.clear();
assertTrue(qd.isEmpty());
}
@Override
public void onNext(Integer value) {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
});
}
@Test
public void collectionSupplierThrows() {
Observable.just(1)
.distinct(Functions.identity(), new Callable<Collection<Object>>() {
@Override
public Collection<Object> call() throws Exception {
throw new TestException();
}
})
.test()
.assertFailure(TestException.class);
}
@Test
public void collectionSupplierIsNull() {
Observable.just(1)
.distinct(Functions.identity(), new Callable<Collection<Object>>() {
@Override
public Collection<Object> call() throws Exception {
return null;
}
})
.test()
.assertFailure(NullPointerException.class)
.assertErrorMessage("The collectionSupplier returned a null collection. Null values are generally not allowed in 2.x operators and sources.");
}
@Test
public void badSource() {
List<Throwable> errors = TestHelper.trackPluginErrors();
try {
new Observable<Integer>() {
@Override
protected void subscribeActual(Observer<? super Integer> observer) {
observer.onSubscribe(Disposables.empty());
observer.onNext(1);
observer.onComplete();
observer.onNext(2);
observer.onError(new TestException());
observer.onComplete();
}
}
.distinct()
.test()
.assertResult(1);
TestHelper.assertUndeliverable(errors, 0, TestException.class);
} finally {
RxJavaPlugins.reset();
}
}
}